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From: "kevin.bracey at alifsemi dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107515] New: MVE: Generic functions do not accept
 _Float16 scalars
Date: Thu, 03 Nov 2022 09:27:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107515

            Bug ID: 107515
           Summary: MVE: Generic functions do not accept _Float16 scalars
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kevin.bracey at alifsemi dot com
  Target Milestone: ---

Compiling C code, generic functions taking floating point scalars in arm_mv=
e.h
do not accept `_Float16` values.

// Using gcc -mcpu=3Dcortex-m55 -O2
// Uploaded at https://godbolt.org/z/7jrqWWroY

#include <arm_mve.h>

void test(void)
{
    float16x8_t x;

    x =3D vmulq(x, 0.5); // ok
    x =3D vmulq(x, 0.5f); // ok
    x =3D vmulq(x, (__fp16) 0.5); // ok
    x =3D vmulq(x, 0.15f16); // rejected
    x =3D vmulq(x, (_Float16) 0.15); // rejected
}

Output:

<source>:10:9: error: '_Generic' selector of type 'int (*)[4][39]' is not
compatible with any association
   10 |     x =3D vmulq(x, 0.15f16); // rejected
      |         ^~~~~
<source>:11:9: error: '_Generic' selector of type 'int (*)[4][39]' is not
compatible with any association
   11 |     x =3D vmulq(x, (_Float16) 0.15); // rejected
      |         ^~~~~=